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Hemispheric Temperatures

Notes:

The larger peak to peak variability in the Northern hemisphere temperature is primarily caused by the ebb and flow of surface ice and snow. In the dead of winter, the top 30˚ of latitude, excluding a small amount of water, is covered in ice and snow. In the Southern hemisphere, Antarctic ice is relatively constant and the bottom 30˚ of latitude is mostly water, so there's less reflectivity variability from ice. However, water does become more reflective at lower Sun angles. Most of the Southern hemisphere variability is due to this, while most of the Northern hemisphere variability is due to ice and snow coverage.

The North gets colder in winter and warmer in summer than the South does in it's respective seasons. The South has a more surface water than the North, but the big difference is the latitudinal distribution of that water.